Strings are typically delimited by quotes, which raises the problem of dealing with strings that include quotes.

learn more… | top users | synonyms

0
votes
1answer
39 views

How to pass arguments to a Java process from within a shell script [on hold]

This may be a duplicate but the initial questions I have found the answer did not resolve the issue. Yet another re-write of the question. I have this Java application: public static void ...
2
votes
3answers
32 views

echo and command substitution

I wrote a very basic script of command substitution which is below: #!/bin/bash files=$(ls *.fastq); echo $files The directory contains bunch of .fastq file and I just want to use echo command to ...
1
vote
1answer
18 views

adb pull not accepting a variable as source, gives *' does not exist..* error

I'm trying to use $EXTERNAL_STORAGE in the adb pull command. I noticed that the variable has its scope defined in Android only and so it would not work successfully in adb pull ...
1
vote
1answer
871 views

Run a command under sudo over SSH

I am accessing remote machine in Linux using Bash scripting.My code is as follows #!/bin/bash ssh -i manu_bp.pem ubuntu@54.68.67.68 <<EOF sudo -s cat ...
1
vote
2answers
49 views

Escaping a linux command

I'm trying to run a command from a script I wrote that basically replaces a string in file vzctl exec VZID sed -i 's/\/>/address="$IP\/255.255.255.0"\/\>/' "file.xml" The problem is the ...
2
votes
2answers
51 views

Alias doesn't seem to read from STDIN

I'm looking for an alias to convert hex from hexdump output into "Python's" hex notation: $ echo "5f 74 34 0c c9 7b 9f f8 7a 7c 46 ff ff 5c 31 26" | sed 's/ */\\x/g' | awk '{print "\\x"$0}' ...
0
votes
2answers
29 views

How to pass an environment variable when change rooting?

I don't seem to be able to pass an environment variable to a chroot: $ sudo apt-get install debootstrap dchroot $ sudo debootstrap trusty mychroot $ sudo chroot mychroot /bin/bash -c "MY_VAR=5; echo ...
2
votes
3answers
46 views

Duplicate a file with random probability

I have a directly full of images and I am trying to put together a script/command that will randomly copy (with some probability) the image to a location with a random name at that destination ...
0
votes
2answers
25 views

Putting a single quote in a filename [duplicate]

We can a make a directory named $"dollars"&<>\dogs if we surround it with single quotes like the following mkdir '$"dollars"&<>\dogs' However, what if I want to include a ...
10
votes
1answer
523 views

How to execute an arbitrary simple command over ssh without knowing the login shell of the remote user?

ssh has an annoying feature in that when you run: ssh user@host cmd and "here's" "one arg" Instead of running that cmd with its arguments on host, it concatenates that cmd and arguments with spaces ...
2
votes
2answers
53 views

What other special characters are there?

For filenames, I know that you have to use either a double quotes or a backslash to include a space in your file name. Like mkdir "I like coffee" is the same as mkdir I\ like\ coffee Now when you ...
1
vote
2answers
1k views

Running system bash command in PHP script - syntax error: unexpected T_LNUMBER

If anyone can shed some light on my issue that'd be great. Please don't down-vote me; I'm new to the language and the OS itself and I'm trying my best to research before asking questions, so any ...
-1
votes
1answer
24 views

Assign regular expression as character for a variable

I am wondering is there is a way to assign a regular expression as a character in a string to a variable and not have the regular expression change my variable. For example: in my directory I am ...
1
vote
2answers
39 views

A variable in Bash that contains quotation marks and spaces

I'm trying the following in a Bash script: MV_PARAMS='"foo 1" "foo 2"' mv $MV_PARAMS What I want to actually execute is: mv "foo 1" "foo 2" But it doesn't seem to work. trying this: mv ...
4
votes
1answer
166 views

Any problem assigning one variable to another in shell without using quotes? [duplicate]

This question is about assigning the entire contents of one variable to another variable. Variable is not being used (sent to echo, etc.) No parameter expansion is being done during the assignment. ...
4
votes
1answer
57 views

“$@” expansion for user defined variables

I'm trying to get a (bourne shell) variable to expand like "$@" so it produces multiple words with some having preserved spaces. I've tried defining the variable in many different ways but still can't ...
3
votes
2answers
126 views

Using bash variables in perl command in bash script

I am trying to generate a hashed password as in /etc/shadow file, using bash script. The user is prompted for the password which is saved in a variable PSWD. I have extracted the Hash and the salt ...
3
votes
3answers
7k views

Checking if an input number is an integer

I'm trying to check if an input is an integer and I've gone over it a hundred times but don't see the error in this. Alas it does not work, it triggers the if statement for all inputs ...
0
votes
2answers
40 views

Variable expansion inside parenthesis and quotes

In the script below, I can't seem to make $var1 expand in the second statement. I've tried $var1, ${var1}, echo $var1 and '$var1'. It is inside a few sets of quotes and parenthesis which I guess is ...
0
votes
3answers
328 views

Why does passing a HEREDOC as a string to `ruby -e` not work?

For reasons I don't understand, it seems to be impossible to pass a heredoc as an expression to a Ruby interpreter: $ ruby -e <<END heredoc> puts 'hi' heredoc> END ruby: no code ...
1
vote
2answers
38 views

Escaping double quotes in string

I have a string message which contains data in double quotes. I need to put \ in front of every double quote how can u do it in shell ? I used Perl and it works fine, but I'm looking for sh command: ...
1
vote
1answer
63 views

How do I nest quotes four deep?

I have a complex command that I'm running in watch to nag users to get out of a filesystem when I need to unmount it. The following is working watch -ben5 $'lsof /mnt/unfs && ps --no-headers ...
0
votes
1answer
50 views

Why the number is rounded over ssh? [duplicate]

localhost:~ $ df -k / | awk '{print $3/1024/1024/1024}' 0 0.00618061 localhost:~ $ ssh localhost "df -k / | awk '{print $3/1024/1024/1024}'" 01 01
2
votes
3answers
209 views

How to pass argument with char ( in remote path?

I'm trying to move a file with rsync to a remote location, The file has be be named : DRRS_(H264).mp4 but when I try : rsync -azR output.mp4 user@server.com:encoded/somepath/DRRS_(H264).mp4 it ...
2
votes
2answers
149 views

How to generate a random string in a profile alias?

I have an alias in my server's /etc/profile which generates a random directory on command, like this: alias rdir="mkdir -p ./`cat /dev/random | tr -cd 'a-z0-9' | head -c 8`/" But it turns out this ...
1
vote
1answer
44 views

Copy array of multiple files with globbed extensions, in bash 3.2

I've found bits and pieces of each of the things I want to do across the Web, but nothing exactly fits my use case. I'm trying to write a script that copies multiple specific files to a directory on ...
3
votes
4answers
857 views

Print a string including single quotes and other special characters

How can I write this with an AIX script correctly? My requirement is to write this command in test.txt: clock=$(prtconf -s | awk '{print $4,$5}') I tried this command: print 'clock=$(prtconf -s | ...
1
vote
2answers
27 views

How can I properly escape a string to be passed to a shell with a command argument [duplicate]

How can I properly escape arbitrary commands? For example: sudo -u chris sh -c 'echo "\"leftright\""' The above echos: "leftright" How would I echo out: "left'right" I've tried the ...
3
votes
3answers
112 views

What is the difference of defining a variable with or without quotation marks? [duplicate]

If I define a variable with the quotation mark: TEMP="~/Dropbox" then ls $TEMP would not work, instead echo $TEMP | ls works. And to get the same result, I can also define the variable ...
4
votes
2answers
76 views

Is it possible to escape quotes within escape quotes within escape quotes within escape quotes?

I'm guessing someone will tell me I'm doing something wrong and dumb and noobish, but I'm trying to script something in the most straightforward method possible and use sudo commands to do something ...
2
votes
2answers
166 views

How to pass shell variable to an awk search pattern?

In my bash script I have a variable that I am trying to pass to a pattern to search for using awk. However what I expected to happen is not working. I have the following text file (text.txt): ...
79
votes
5answers
193k views

How do I grep for multiple patterns?

I want to find all lines in several files that match one of two patterns. I tried to find the patterns I'm looking for by typing grep (foo|bar) *.txt but the shell interprets the | as a pipe and ...
1
vote
2answers
38 views

Something wrong with spaces in zenity trying in a script [duplicate]

While this is directly executed in terminal it works fine zenity --info --text "pure info" --title "get info" But this script doen't work what's wrong? !/bin/bash ZEN="--info --text \"pure info\" ...
50
votes
3answers
20k views

Why does my shell script choke on whitespace or other special characters?

Or, an introductory guide to robust filename handling and other string passing in shell scripts. I wrote a shell script which works well most of the time. But it chokes on some inputs (e.g. on some ...
1
vote
2answers
83 views

how to store output of a command into array with each value in a double quote

I want to store each output in double quoted array values. values can have space also. FOUNDFILES=($(locate --database ~/.locate.db -i -b "$INPUT")) if input to the locate command is very very ...
0
votes
1answer
46 views

ln -s removes part of a a file name, filename passed as a var

I use a script to link some of the files I download to a different directory. When there are "-" in the file name, ln - s wont read the path correctly, even though the variable will be logged ...
4
votes
2answers
385 views

New line in bash variables

I'm trying to store multiple lines in a bash variable, but it doesn't seem to work. For example, if I list /bin one file per line and store it in $LS, then I pass $LS as stdin to wc, it always ...
0
votes
1answer
30 views

–mtune=arm920t”: command not found

When I run CC=”${CROSS_COMPILE}gcc –march=armv4t –mtune=arm920t” I get a –march=armv4t: command not found error, when i remove –march=armv4t and run: CC=”${CROSS_COMPILE}gcc –mtune=arm920t” i get ...
16
votes
6answers
10k views

How can you combine all lines that end with a backslash character?

Using a common command line tool like sed or awk, is it possible to join all lines that end with a given character, like a backslash? For example, given the file: foo bar \ bash \ baz dude \ happy ...
1
vote
1answer
45 views

Can see file in /usr/local/bin with ls, but attempting to run it yields file not found?

I'm on OS X, but since this is terminal work I figured this was the best place to ask. I'm trying to get Sublime Text to work at the command line via subl and having no luck. I ran ln -s <location ...
2
votes
1answer
45 views

View remote value of $PATH inside shell script

When executing this bash script, it only shows my local path. ssh ${REMOTE_HOST} 'bash -s' <<EOL set -e source ~/.profile echo $PATH # Commands here don't work because $PATH is ...
29
votes
2answers
10k views

How can I execute `date` inside of a cron tab job?

I want to create a log file for a cron script that has the current hour in the log file name. This is the command I tried to use: 0 * * * * echo hello >> ~/cron-logs/hourly/test`date "+%d"`.log ...
-1
votes
2answers
75 views

bash scripting and PS1 prompt

Im trying to customize the way the PS1 prompt shows in terminal and CLI on Arch Linux, but it's not printing the proper thing it should be doing. First up is I'm trying to colorize parts of the PS1 ...
0
votes
2answers
3k views

variables in find command and more shell problem [duplicate]

Possible Duplicate: Recursive rename files and directories I wrote the following script: #!/bin/bash SAVEIFS=$IFS alias export='export' IFS=$(echo -en "\n\b") find $1 -name "*" ...
0
votes
1answer
47 views

Binary not accesible from Bash despite being in path

I am learning how to program in Racket. It's binary is in "/Applications/Racket v6.2/bin/racket". Let me show what happens: MacBook:~ enedil$ echo $PATH /Applications/Racket\ ...
-1
votes
1answer
65 views

Pass string value to date in Unix

mm="27 Jun 2011" dd=$(date -d'27 Jun 2011' +%Y%m%d) echo $dd I want to use value of mm in second line. When i tried like below dd=$(date -d'$mm' +%Y%m%d) It is giving error.
6
votes
4answers
866 views

Add a newline into a filename with `mv`

It's a serious question. I test some awk scripts and I need files with a newline in their names. Is it possible to add a newline into a filename with mv? I now, I can do this with touch: touch ...
55
votes
2answers
2k views

Security implications of forgetting to quote a variable in bash/POSIX shells

If you've been following unix.stackexchange.com for a while, you should hopefully know by now that leaving a variable unquoted in list context (as in echo $var) in Bourne/POSIX shells (zsh being the ...
0
votes
2answers
61 views

How do you search ! in man sed?

You cannot search ! directly because it puts process behind. For instance, you cannot search ! in sed man. How can you search ! in man?
1
vote
1answer
650 views

Remote ssh command not sending echo variable from a ksh script on AIX

I'm need to get the value of a variable from a remote host in a script using SSH and have to source an environment file first that does a shift at the end of its run. The command works locally and I ...